Process for the regeneration of decolorizing-carbons



GEORGE BLARDONE, OF NEW ORLEANS, LOUISIANA.

PROCESS FOR THE REGENERATION OF DECOLORIZING-CARBONS.

No Drawing.

To all whom it may concern:

Be it known that I, GEORGE BLanDoNn; a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented certa1nnew and useful Improvements in Processes regeneration or revivification of carbons in for the Regeneration of Decolorizing- Carbons,.of which the following is a specification. 1

This invention relates to a process for the of time its particles. become impregnated with pectins and other gummy-substances stances .which it has ytained excellent results by the carrying out .molasse's solution was which mask the particles in such a manner as to greatly detract from,'if not to entirely destroy, the decolorizing power of the carbon. Therefore, in order that a decolorizing carbon may be repeatedly employed it is necessary that it be regenerated or revivi- 'fied by a treatment which will remove or destroy the pectms and other gummy subtaken 'upduring the decolorizing process. .The' gummy substances'present decolorized consist largely of complex carloohydraftes, or n other words, compounds containing carbonyl groups. I have found that all-ofthesecompou'nds are capable of forming addition compounds .when treated with s'ulfurous acid-and 'with sulfites or bisulfites. 1 V q As an example ofmy process; I have'obfollows: 100 cc. of a boiled for one minute with two grams of carbon. obtained by burning rice chaff or hulls. The carbon was then filterhd off and washed with water and ofan experiment as finally dried. The carbon in this state had absorbed pectinsand. other gummy substances and represented, in effect, a carbon which had been employed for a considerable Specification of Letters Patent.

. also be employed the weight of in the' raw material to be Patented Jan. 6, 1920.

Application filed July 9, 1917. Serial no. 179,577.

length-of time in a sugar refining process.

In this state the carbon was boiled for thirty mmutes with 200 cc. of 'a ten per cent. solution of sodium bisulfite. A two per cent. solution of sulfurous acid (cold) was employed with good results. However the strength of the sulfurous acid may be Varied.

Heat may also be 'employedin the process. The regenerated or revivified carbon was then separated by filtration and was washed and finallydried and upon employment in decolorizing 100 cc. of a molasses solution was found to give excellent results.

While sodium bisulfite is above given as an example of a bisulfite that could be employed,- it will be understood that sulfurous acid reduced to the required strength may or sulfites. While the carbon treated by the experiment consisted of burnt chafi' and hulls of rice,

the process is adaptable for the treatment of any other vegetable,

animal or mineral charcoal or carbonaceous materials.

As a substitute for the sodium bisu'lfite mentioned it may be found desirable, from a commercial standpoint to employ calcium bisulfite. Also in carrying out the process the solution .of bisulfite or sulfite employed should at least equal the weight of the carbon.

Having thus described the invention, what is claimed asnew is: I

1. That process for the regeneration or revivification of decolorizing and deodorizing carbonswhich consists 'washingvthe said carbon witha solution o'f sodium bisulfite. a

2. That process for the regeneration or revivificationof decolorizing and deodorizing carbons which consists in said carbon with a solution of a sulfite.

3. That process revivification of decolorizing and deodorizing carbons which consists in treating the said carbon with a solution of abisulfite.

In testimonv whereof I aflix mlyg signature.

GEORGE BLABDON [L.s.]

as well as other bisulfites It will also be understood that for the regeneration or 

